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-90=-5(6+4x)
We simplify the equation to the form, which is simple to understand
-90=-5(6+4x)
Reorder the terms in parentheses
-90=+(-30-20x)
Remove unnecessary parentheses
-90=-30-20x
We move all terms containing x to the left and all other terms to the right.
+20x=-30+90
We simplify left and right side of the equation.
+20x=+60
We divide both sides of the equation by 020 to get x.
x=3
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